221422402 has 4 divisors (see below), whose sum is σ = 332133606. Its totient is φ = 110711200.

The previous prime is 221422379. The next prime is 221422417. The reversal of 221422402 is 204224122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 221087161 + 335241 = 14869^2 + 579^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221422402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55355599 + ... + 55355602.

Almost surely, 2^221422402 is an apocalyptic number.

221422402 is a deficient number, since it is larger than the sum of its proper divisors (110711204).

221422402 is a wasteful number, since it uses less digits than its factorization.

221422402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110711203.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 221422402 is about 14880.2688819793. The cubic root of 221422402 is about 604.9793058058.

Adding to 221422402 its reverse (204224122), we get a palindrome (425646524).

The spelling of 221422402 in words is "two hundred twenty-one million, four hundred twenty-two thousand, four hundred two".